1|Page
MEP SYSTEMS I (COSC 325) ELECTRICAL EXAM –
HOUSTON 2026/2027NEWEST ACTUAL EXAM
COMPLETE 150 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||BRAND NEW!!!
What is a symmetric waveform that contains 360 electrical
degrees? (21-456) - ANSWER-AC Sine Wave
What is one complete positive and negative alteration of a
wave form? (21-456) - ANSWER-Cycle
What is half a Cycle? (21-456) - ANSWER-Alternation
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How many Alternations does a Sine Wave have? (21-456)
- ANSWER-2
1 Positive and 1 Negative
Power plant generators create ____ ____ _____ ____
electricity. (20-433) - ANSWER-Three-Phase Alternating
Current
What is an electric device that uses electromagnetism to
change (step-up or step-down) AC voltage from one level
to another? (20-434) - ANSWER-Transformer
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What must you do to electricity before it enters a building
from the wire? (20-434) - ANSWER-Step-down
What do transformers step electricity down to to service
apartments, condos, townhomes, and homes? (20-434) -
ANSWER-120 V/ 240 V
What is an electrical device containing fuses or circuit
breakers for protecting the individual circuits of a
residence, and serves as means of disconnecting the
entire residence from the distribution system? (20-435) -
ANSWER-Service Panel
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Where can Service Panels be found? (20-435) -
ANSWER-Wall-mounted in basements, utility rooms, and
attached garages. Must be easily accessible to residents.
What is a complete path (when ON) for current to take and
INCLUDES electrical devices, circuit protection,
conductors, and loads? (20-436) - ANSWER-Circuit
What protects occupants by providing a safe pathway for
unwanted electricity to enter the ground? (20-436) -
ANSWER-Grounding
What are the two levels of grounding? (20-436) -
ANSWER-System Ground
MEP SYSTEMS I (COSC 325) ELECTRICAL EXAM –
HOUSTON 2026/2027NEWEST ACTUAL EXAM
COMPLETE 150 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||BRAND NEW!!!
What is a symmetric waveform that contains 360 electrical
degrees? (21-456) - ANSWER-AC Sine Wave
What is one complete positive and negative alteration of a
wave form? (21-456) - ANSWER-Cycle
What is half a Cycle? (21-456) - ANSWER-Alternation
,2|Page
How many Alternations does a Sine Wave have? (21-456)
- ANSWER-2
1 Positive and 1 Negative
Power plant generators create ____ ____ _____ ____
electricity. (20-433) - ANSWER-Three-Phase Alternating
Current
What is an electric device that uses electromagnetism to
change (step-up or step-down) AC voltage from one level
to another? (20-434) - ANSWER-Transformer
,3|Page
What must you do to electricity before it enters a building
from the wire? (20-434) - ANSWER-Step-down
What do transformers step electricity down to to service
apartments, condos, townhomes, and homes? (20-434) -
ANSWER-120 V/ 240 V
What is an electrical device containing fuses or circuit
breakers for protecting the individual circuits of a
residence, and serves as means of disconnecting the
entire residence from the distribution system? (20-435) -
ANSWER-Service Panel
, 4|Page
Where can Service Panels be found? (20-435) -
ANSWER-Wall-mounted in basements, utility rooms, and
attached garages. Must be easily accessible to residents.
What is a complete path (when ON) for current to take and
INCLUDES electrical devices, circuit protection,
conductors, and loads? (20-436) - ANSWER-Circuit
What protects occupants by providing a safe pathway for
unwanted electricity to enter the ground? (20-436) -
ANSWER-Grounding
What are the two levels of grounding? (20-436) -
ANSWER-System Ground
